[Bug 241980] panic: I/O to pool appears to be hung on vdev

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241980

--- Comment #1 from Eugene Grosbein <eugen at freebsd.org> ---
The system routinely creates snapshots for ZVOLs and removes old snapshots, so
gstat -adI3s -f 'da[2-6].*' shows that system constandly floods SSDs with ATA
TRIM requests.

I decreased kern.cam.da.[2-6].delete_max from default 17179607040 to 262144
after 1.5 days since update to 11.3-STABLE hoping to decrease latency of
read/write operations but it panices again in several hours after that.

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